I know this may seem not very related to Slipknot, but a lot of people agree that Avatar is very similar to Slipknot in a lot of ways, and I know several people here like the band, so I thought I'd personally invite you guys to join the subreddit I just created for the band: http://www.reddit.com/r/AvatarMetal/

I'd really love to have another active band community here on Reddit, so anyone who's interested and knows others who may be as well, please spread the word!

Also, if you still haven't checked out Avatar, give them a shot! Considering you all like Slipknot, odds are you'll at least like something by Avatar. I'd suggest Smells Like a Freakshow, Tower, Vultures Fly, and Bloody Angel, when it comes to songs that can be considered similar to Slipknot.